I think there are two different versions of them for me.
1. a woman that openly exposes her sexual activities on the internet for people to see. one that comes to mind is Wifey's world. Pretty much a self-made porn star. Webcam girls are definitely a web *****.
2. a woman that has many sexual encounters with different men, and so many that are filmed or photographed that nearly everyone can find a pic or video of her doing something with someone. She knows about it, brags about it, and doesn't really care. She thinks having a high body count is a badge of honor.
I don't think a woman that unknowingly has her pics or videos released to the public is one. This is just someone that is untrustworthy doing some underhanded shit, or revenge porn. Everyone has sex, and some people trust others with media of it. I think it shows the character of the person that broke that trust more than it exposes the woman of being immoral, slutty, or loose.